:root {
    --ink: #1a1d24;
    --ink-2: #5f6673;
    --ink-3: #9aa2b1;
    --line: #eceef2;
    --bg: #f7f8fa;
    --card: #ffffff;
    --brand: #e8452c;
    --brand-soft: #fdeee9;
    --radius: 14px;
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
}

body {
    background: var(--bg);
    color: var(--ink);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
        "Microsoft YaHei", sans-serif;
    font-size: 15px;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
    text-decoration: none;
}

.wrap {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 顶部 */
.topbar {
    background: rgba(255, 255, 255, 0.92);
    border-bottom: 1px solid var(--line);
    position: sticky;
    top: 0;
    z-index: 20;
    backdrop-filter: saturate(180%) blur(8px);
}

.topbar-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 62px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    font-size: 17px;
    letter-spacing: -0.2px;
}

.logo-mark {
    width: 30px;
    height: 30px;
    border-radius: 9px;
    background: var(--brand);
    color: #fff;
    font-size: 15px;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav {
    display: flex;
    gap: 26px;
    font-size: 14px;
    color: var(--ink-2);
}

.nav a:hover {
    color: var(--ink);
}

.nav a.on {
    color: var(--brand);
    font-weight: 500;
}

/* 首屏 */
.hero {
    padding: 56px 0 40px;
}

.hero h1 {
    margin: 0 0 14px;
    font-size: 34px;
    line-height: 1.3;
    letter-spacing: -0.6px;
}

.hero p {
    margin: 0;
    color: var(--ink-2);
    font-size: 16px;
    max-width: 620px;
}

.hero-meta {
    margin-top: 22px;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    font-size: 13px;
    color: var(--ink-3);
}

.chip {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 5px 13px;
}

/* 区块标题 */
.section {
    padding: 14px 0 40px;
}

.section-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    margin-bottom: 18px;
}

.section-head h2 {
    margin: 0;
    font-size: 20px;
    font-weight: 600;
}

.section-head span {
    font-size: 13px;
    color: var(--ink-3);
}

/* 商品网格 */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 16px;
}

.card {
    background: var(--card);
    border-radius: var(--radius);
    border: 1px solid var(--line);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 24px rgba(26, 29, 36, 0.07);
}

.cover {
    height: 158px;
    background: linear-gradient(135deg, var(--a, #eef1f6), var(--b, #dfe4ee));
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(26, 29, 36, 0.34);
    font-size: 13px;
    letter-spacing: 1px;
}

.card-body {
    padding: 14px 15px 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex: 1;
}

.card-cat {
    font-size: 12px;
    color: var(--ink-3);
}

.card-title {
    font-size: 15px;
    font-weight: 500;
    line-height: 1.45;
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-reason {
    font-size: 13px;
    color: var(--ink-2);
    margin: 0;
    flex: 1;
}

.price-row {
    display: flex;
    align-items: baseline;
    gap: 8px;
    margin-top: 2px;
}

.price-now {
    color: var(--brand);
    font-size: 21px;
    font-weight: 600;
    letter-spacing: -0.4px;
}

.price-now small {
    font-size: 13px;
    font-weight: 500;
}

.price-old {
    color: var(--ink-3);
    font-size: 13px;
    text-decoration: line-through;
}

.coupon {
    display: inline-block;
    font-size: 12px;
    color: var(--brand);
    background: var(--brand-soft);
    border-radius: 6px;
    padding: 2px 8px;
    margin-left: auto;
}

/* 说明条 */
.notice {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 22px 24px;
    margin-bottom: 40px;
}

.notice h3 {
    margin: 0 0 10px;
    font-size: 15px;
    font-weight: 600;
}

.notice ul {
    margin: 0;
    padding-left: 18px;
    color: var(--ink-2);
    font-size: 14px;
}

.notice li {
    margin: 6px 0;
}

/* 分类 */
.cats {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 12px;
}

.cat {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 18px;
    font-size: 14px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--ink-2);
}

.cat b {
    color: var(--ink);
    font-weight: 500;
}

/* 页脚 */
.footer {
    border-top: 1px solid var(--line);
    background: #fff;
    margin-top: 20px;
    padding: 34px 0 40px;
    font-size: 13px;
    color: var(--ink-3);
}

.footer-links {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    margin-bottom: 12px;
}

.footer-links a:hover {
    color: var(--ink);
}

.footer p {
    margin: 4px 0;
}

/* 内容页 */
.doc {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 38px 40px;
    margin: 36px 0 44px;
}

.doc h1 {
    font-size: 26px;
    margin: 0 0 6px;
    letter-spacing: -0.4px;
}

.doc .updated {
    color: var(--ink-3);
    font-size: 13px;
    margin-bottom: 26px;
}

.doc h2 {
    font-size: 17px;
    margin: 30px 0 10px;
}

.doc p,
.doc li {
    color: var(--ink-2);
    font-size: 15px;
}

.doc ul {
    padding-left: 20px;
}

.doc li {
    margin: 7px 0;
}

@media (max-width: 640px) {
    .hero {
        padding: 34px 0 26px;
    }
    .hero h1 {
        font-size: 25px;
    }
    .nav {
        gap: 16px;
        font-size: 13px;
    }
    .doc {
        padding: 26px 20px;
    }
    .grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
        gap: 12px;
    }
    .cover {
        height: 128px;
    }
}